WPF PASSWORDBOX VALIDATE REQUIRED SOFTWARE
The domain-part is quite well defined and needs to be understood for the routing of email addresses by everyone, while the exact meaning of the local-part is defined by the receiving email server software and the sender does not necessarily need to understand the local-part structure. The domain-part is the internet DNS address of the email server, while local-part is the name of the "mailbox" within that email server. This part describes what usually is called an email the address has two parts: If there is no display name, angle brackets are neither needed. "": is called in the specification angle-addr and contains addr-spec (the email address used for routing the email) in angle brackets.It is not used for the routing of the email, but allows the email address to be shown in a more user friendly form. This higher level specifies, among others, that an Address can consist of a display-name and an Addr-Spec, which is the part we usually mean when we talk about email addresses. It defines a valid email address in 2 steps: 1. The relevant specification can be found at RFC 5322: Internet Message Format: Address Specification. It also informs the user if he tries to close the window without saving the data. Since this control is part of WpfWindowLib, it doesn't let the user save the data if the email address is required and missing.
Of course, best is if you prevent the user from making invalid input and control which keystrokes he can make. The control must be flexible enough to meet your requirements, i.e., if you need a strict control with precise formatting or if you just want to alert the user if he keyed in a strange email address. The specifications allow for a great variety, but in reality only few formats are used, because the exotic ones might get rejected by some email software (clients like Outlook, servers like Exchange).
Writing a WPF control which validates email addresses is a challenge, because nearly all Unicode characters and many formats are allowed.
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